Challenge - response - device, authentication system, method for generating a response - signal from a challenge - signal and a method for authenticating

摘要

Challenge - response - device (1) with the following features:an input (5) for receiving a challenge - signal;an output (6) for outputting a response - signal,wherein, in a challenge - response - process a response - signal can be produced;a feedback shift register (2);a memory (3) for storing a state of the feedback shift register (2);a device (8) for applying an old shift register state, the a preceding challenge - response - process is assigned to the feedback shift register (2), in order from an old shift register state to obtain a new shift register state, of a current challenge - response - process is assigned; andan arithmetic unit (4), which is arranged in a challenge - response - process using the challenge - signal and of the shift register condition of the current challenge - response - process is associated, the response - signal for the actual challenge - response - process to calculate.